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We demonstrate an ultrabright narrow-band two-photon source at the 1.5μm telecom wavelength for long-distance quantum communication. By utilizing a bow-tie cavity, we obtain a cavity enhancement factor of 4.06 ' 104. Our measurement of the second-order correlation function G(2)(τ) reveals that the linewidth of 2.4MHz has been hitherto unachieved in the 1.5μm telecom band. This two-photon source is useful for obtaining a high absorption probability close to unity by quantum memories set inside quantum repeater nodes. Furthermore, to the best of our knowledge, the observed spectral brightness of 3.94 ' 105 pairs/(s&MHz&mW) is also the highest reported over all wavelengths.


  • Applied physics Express

    Applied physics Express (11), 042801-1-042801-5, 2018-03-16

    Japan Society of Applied Physics through Institute of Pure and Applied Physics


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